US Patent 9993033 E-cigarette personal vaporizer

A portable, personal storage and carrying case for an e-liquid e-cigarette PV in which the case includes: an electrical power source for re-charging a rechargeable battery in the PV; a user-replaceable reservoir for holding e-liquid; and an electrical or electronic pump adapted to transfer e-liquid from the reservoir to a chamber in the PV, the pump delivering a pre-defined or variable quantity of e-liquid from the reservoir, and in which the case displays a visual indication of e-liquid volume remaining in the reservoir.